1 /*
2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #ifndef lint
31 static const char copyright[] =
32 "@(#) Copyright (c) 1983, 1993\n\
33 The Regents of the University of California. All rights reserved.\n";
34 #endif /* not lint */
35
36 #ifndef lint
37 #if 0
38 static char sccsid[] = "@(#)tftpd.c 8.1 (Berkeley) 6/4/93";
39 #endif
40 #endif /* not lint */
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
43
44 /*
45 * Trivial file transfer protocol server.
46 *
47 * This version includes many modifications by Jim Guyton
48 * <guyton@rand-unix>.
49 */
50
51 #include <sys/param.h>
52 #include <sys/ioctl.h>
53 #include <sys/stat.h>
54 #include <sys/socket.h>
55
56 #include <netinet/in.h>
57 #include <arpa/tftp.h>
58
59 #include <ctype.h>
60 #include <errno.h>
61 #include <fcntl.h>
62 #include <netdb.h>
63 #include <pwd.h>
64 #include <stdint.h>
65 #include <stdio.h>
66 #include <stdlib.h>
67 #include <string.h>
68 #include <syslog.h>
69 #include <tcpd.h>
70 #include <unistd.h>
71
72 #include "tftp-file.h"
73 #include "tftp-io.h"
74 #include "tftp-utils.h"
75 #include "tftp-transfer.h"
76 #include "tftp-options.h"
77
78 static void tftp_wrq(int peer, char *, ssize_t);
79 static void tftp_rrq(int peer, char *, ssize_t);
80
81 /*
82 * Null-terminated directory prefix list for absolute pathname requests and
83 * search list for relative pathname requests.
84 *
85 * MAXDIRS should be at least as large as the number of arguments that
86 * inetd allows (currently 20).
87 */
88 #define MAXDIRS 20
89 static struct dirlist {
90 const char *name;
91 int len;
92 } dirs[MAXDIRS+1];
93 static int suppress_naks;
94 static int logging;
95 static int ipchroot;
96 static int create_new = 0;
97 static const char *newfile_format = "%Y%m%d";
98 static int increase_name = 0;
99 static mode_t mask = S_IWGRP | S_IWOTH;
100
101 struct formats;
102 static void tftp_recvfile(int peer, const char *mode);
103 static void tftp_xmitfile(int peer, const char *mode);
104 static int validate_access(int peer, char **, int);
105 static char peername[NI_MAXHOST];
106
107 static FILE *file;
108
109 static struct formats {
110 const char *f_mode;
111 int f_convert;
112 } formats[] = {
113 { "netascii", 1 },
114 { "octet", 0 },
115 { NULL, 0 }
116 };
117
118 int
main(int argc,char * argv[])119 main(int argc, char *argv[])
120 {
121 struct tftphdr *tp;
122 int peer;
123 socklen_t peerlen, len;
124 ssize_t n;
125 int ch;
126 char *chroot_dir = NULL;
127 struct passwd *nobody;
128 const char *chuser = "nobody";
129 char recvbuffer[MAXPKTSIZE];
130 int allow_ro = 1, allow_wo = 1;
131
132 tzset(); /* syslog in localtime */
133 acting_as_client = 0;
134
135 tftp_openlog("tftpd", LOG_PID | LOG_NDELAY, LOG_FTP);
136 while ((ch = getopt(argc, argv, "cCd:F:lnoOp:s:u:U:wW")) != -1) {
137 switch (ch) {
138 case 'c':
139 ipchroot = 1;
140 break;
141 case 'C':
142 ipchroot = 2;
143 break;
144 case 'd':
145 if (atoi(optarg) != 0)
146 debug += atoi(optarg);
147 else
148 debug |= debug_finds(optarg);
149 break;
150 case 'F':
151 newfile_format = optarg;
152 break;
153 case 'l':
154 logging = 1;
155 break;
156 case 'n':
157 suppress_naks = 1;
158 break;
159 case 'o':
160 options_rfc_enabled = 0;
161 break;
162 case 'O':
163 options_extra_enabled = 0;
164 break;
165 case 'p':
166 packetdroppercentage = atoi(optarg);
167 tftp_log(LOG_INFO,
168 "Randomly dropping %d out of 100 packets",
169 packetdroppercentage);
170 break;
171 case 's':
172 chroot_dir = optarg;
173 break;
174 case 'u':
175 chuser = optarg;
176 break;
177 case 'U':
178 mask = strtol(optarg, NULL, 0);
179 break;
180 case 'w':
181 create_new = 1;
182 break;
183 case 'W':
184 create_new = 1;
185 increase_name = 1;
186 break;
187 default:
188 tftp_log(LOG_WARNING,
189 "ignoring unknown option -%c", ch);
190 }
191 }
192 if (optind < argc) {
193 struct dirlist *dirp;
194
195 /* Get list of directory prefixes. Skip relative pathnames. */
196 for (dirp = dirs; optind < argc && dirp < &dirs[MAXDIRS];
197 optind++) {
198 if (argv[optind][0] == '/') {
199 dirp->name = argv[optind];
200 dirp->len = strlen(dirp->name);
201 dirp++;
202 }
203 }
204 }
205 else if (chroot_dir) {
206 dirs->name = "/";
207 dirs->len = 1;
208 }
209 if (ipchroot > 0 && chroot_dir == NULL) {
210 tftp_log(LOG_ERR, "-c requires -s");
211 exit(1);
212 }
213
214 umask(mask);
215
216 {
217 int on = 1;
218 if (ioctl(0, FIONBIO, &on) < 0) {
219 tftp_log(LOG_ERR, "ioctl(FIONBIO): %s", strerror(errno));
220 exit(1);
221 }
222 }
223
224 /* Find out who we are talking to and what we are going to do */
225 peerlen = sizeof(peer_sock);
226 n = recvfrom(0, recvbuffer, MAXPKTSIZE, 0,
227 (struct sockaddr *)&peer_sock, &peerlen);
228 if (n < 0) {
229 tftp_log(LOG_ERR, "recvfrom: %s", strerror(errno));
230 exit(1);
231 }
232 getnameinfo((struct sockaddr *)&peer_sock, peer_sock.ss_len,
233 peername, sizeof(peername), NULL, 0, NI_NUMERICHOST);
234
235 /*
236 * Now that we have read the message out of the UDP
237 * socket, we fork and exit. Thus, inetd will go back
238 * to listening to the tftp port, and the next request
239 * to come in will start up a new instance of tftpd.
240 *
241 * We do this so that inetd can run tftpd in "wait" mode.
242 * The problem with tftpd running in "nowait" mode is that
243 * inetd may get one or more successful "selects" on the
244 * tftp port before we do our receive, so more than one
245 * instance of tftpd may be started up. Worse, if tftpd
246 * break before doing the above "recvfrom", inetd would
247 * spawn endless instances, clogging the system.
248 */
249 {
250 int i, pid;
251
252 for (i = 1; i < 20; i++) {
253 pid = fork();
254 if (pid < 0) {
255 sleep(i);
256 /*
257 * flush out to most recently sent request.
258 *
259 * This may drop some request, but those
260 * will be resent by the clients when
261 * they timeout. The positive effect of
262 * this flush is to (try to) prevent more
263 * than one tftpd being started up to service
264 * a single request from a single client.
265 */
266 peerlen = sizeof peer_sock;
267 i = recvfrom(0, recvbuffer, MAXPKTSIZE, 0,
268 (struct sockaddr *)&peer_sock, &peerlen);
269 if (i > 0) {
270 n = i;
271 }
272 } else {
273 break;
274 }
275 }
276 if (pid < 0) {
277 tftp_log(LOG_ERR, "fork: %s", strerror(errno));
278 exit(1);
279 } else if (pid != 0) {
280 exit(0);
281 }
282 }
283
284 /*
285 * See if the client is allowed to talk to me.
286 * (This needs to be done before the chroot())
287 */
288 {
289 struct request_info req;
290
291 request_init(&req, RQ_CLIENT_ADDR, peername, 0);
292 request_set(&req, RQ_DAEMON, "tftpd", 0);
293
294 if (hosts_access(&req) == 0) {
295 if (debug&DEBUG_ACCESS)
296 tftp_log(LOG_WARNING,
297 "Access denied by 'tftpd' entry "
298 "in /etc/hosts.allow");
299
300 /*
301 * Full access might be disabled, but maybe the
302 * client is allowed to do read-only access.
303 */
304 request_set(&req, RQ_DAEMON, "tftpd-ro", 0);
305 allow_ro = hosts_access(&req);
306
307 request_set(&req, RQ_DAEMON, "tftpd-wo", 0);
308 allow_wo = hosts_access(&req);
309
310 if (allow_ro == 0 && allow_wo == 0) {
311 tftp_log(LOG_WARNING,
312 "Unauthorized access from %s", peername);
313 exit(1);
314 }
315
316 if (debug&DEBUG_ACCESS) {
317 if (allow_ro)
318 tftp_log(LOG_WARNING,
319 "But allowed readonly access "
320 "via 'tftpd-ro' entry");
321 if (allow_wo)
322 tftp_log(LOG_WARNING,
323 "But allowed writeonly access "
324 "via 'tftpd-wo' entry");
325 }
326 } else
327 if (debug&DEBUG_ACCESS)
328 tftp_log(LOG_WARNING,
329 "Full access allowed"
330 "in /etc/hosts.allow");
331 }
332
333 /*
334 * Since we exit here, we should do that only after the above
335 * recvfrom to keep inetd from constantly forking should there
336 * be a problem. See the above comment about system clogging.
337 */
338 if (chroot_dir) {
339 if (ipchroot > 0) {
340 char *tempchroot;
341 struct stat sb;
342 int statret;
343 struct sockaddr_storage ss;
344 char hbuf[NI_MAXHOST];
345
346 statret = -1;
347 memcpy(&ss, &peer_sock, peer_sock.ss_len);
348 unmappedaddr((struct sockaddr_in6 *)&ss);
349 getnameinfo((struct sockaddr *)&ss, ss.ss_len,
350 hbuf, sizeof(hbuf), NULL, 0,
351 NI_NUMERICHOST);
352 asprintf(&tempchroot, "%s/%s", chroot_dir, hbuf);
353 if (ipchroot == 2)
354 statret = stat(tempchroot, &sb);
355 if (ipchroot == 1 ||
356 (statret == 0 && (sb.st_mode & S_IFDIR)))
357 chroot_dir = tempchroot;
358 }
359 /* Must get this before chroot because /etc might go away */
360 if ((nobody = getpwnam(chuser)) == NULL) {
361 tftp_log(LOG_ERR, "%s: no such user", chuser);
362 exit(1);
363 }
364 if (chroot(chroot_dir)) {
365 tftp_log(LOG_ERR, "chroot: %s: %s",
366 chroot_dir, strerror(errno));
367 exit(1);
368 }
369 chdir("/");
370 setgroups(1, &nobody->pw_gid);
371 if (setuid(nobody->pw_uid) != 0) {
372 tftp_log(LOG_ERR, "setuid failed");
373 exit(1);
374 }
375 }
376
377 len = sizeof(me_sock);
378 if (getsockname(0, (struct sockaddr *)&me_sock, &len) == 0) {
379 switch (me_sock.ss_family) {
380 case AF_INET:
381 ((struct sockaddr_in *)&me_sock)->sin_port = 0;
382 break;
383 case AF_INET6:
384 ((struct sockaddr_in6 *)&me_sock)->sin6_port = 0;
385 break;
386 default:
387 /* unsupported */
388 break;
389 }
390 } else {
391 memset(&me_sock, 0, sizeof(me_sock));
392 me_sock.ss_family = peer_sock.ss_family;
393 me_sock.ss_len = peer_sock.ss_len;
394 }
395 close(0);
396 close(1);
397 peer = socket(peer_sock.ss_family, SOCK_DGRAM, 0);
398 if (peer < 0) {
399 tftp_log(LOG_ERR, "socket: %s", strerror(errno));
400 exit(1);
401 }
402 if (bind(peer, (struct sockaddr *)&me_sock, me_sock.ss_len) < 0) {
403 tftp_log(LOG_ERR, "bind: %s", strerror(errno));
404 exit(1);
405 }
406
407 tp = (struct tftphdr *)recvbuffer;
408 tp->th_opcode = ntohs(tp->th_opcode);
409 if (tp->th_opcode == RRQ) {
410 if (allow_ro)
411 tftp_rrq(peer, tp->th_stuff, n - 1);
412 else {
413 tftp_log(LOG_WARNING,
414 "%s read access denied", peername);
415 exit(1);
416 }
417 }
418 if (tp->th_opcode == WRQ) {
419 if (allow_wo)
420 tftp_wrq(peer, tp->th_stuff, n - 1);
421 else {
422 tftp_log(LOG_WARNING,
423 "%s write access denied", peername);
424 exit(1);
425 }
426 }
427 exit(1);
428 }
429
430 static void
reduce_path(char * fn)431 reduce_path(char *fn)
432 {
433 char *slash, *ptr;
434
435 /* Reduce all "/+./" to "/" (just in case we've got "/./../" later */
436 while ((slash = strstr(fn, "/./")) != NULL) {
437 for (ptr = slash; ptr > fn && ptr[-1] == '/'; ptr--)
438 ;
439 slash += 2;
440 while (*slash)
441 *++ptr = *++slash;
442 }
443
444 /* Now reduce all "/something/+../" to "/" */
445 while ((slash = strstr(fn, "/../")) != NULL) {
446 if (slash == fn)
447 break;
448 for (ptr = slash; ptr > fn && ptr[-1] == '/'; ptr--)
449 ;
450 for (ptr--; ptr >= fn; ptr--)
451 if (*ptr == '/')
452 break;
453 if (ptr < fn)
454 break;
455 slash += 3;
456 while (*slash)
457 *++ptr = *++slash;
458 }
459 }
460
461 static char *
parse_header(int peer,char * recvbuffer,ssize_t size,char ** filename,char ** mode)462 parse_header(int peer, char *recvbuffer, ssize_t size,
463 char **filename, char **mode)
464 {
465 char *cp;
466 int i;
467 struct formats *pf;
468
469 *mode = NULL;
470 cp = recvbuffer;
471
472 i = get_field(peer, recvbuffer, size);
473 if (i >= PATH_MAX) {
474 tftp_log(LOG_ERR, "Bad option - filename too long");
475 send_error(peer, EBADOP);
476 exit(1);
477 }
478 *filename = recvbuffer;
479 tftp_log(LOG_INFO, "Filename: '%s'", *filename);
480 cp += i;
481
482 i = get_field(peer, cp, size);
483 *mode = cp;
484 cp += i;
485
486 /* Find the file transfer mode */
487 for (cp = *mode; *cp; cp++)
488 if (isupper(*cp))
489 *cp = tolower(*cp);
490 for (pf = formats; pf->f_mode; pf++)
491 if (strcmp(pf->f_mode, *mode) == 0)
492 break;
493 if (pf->f_mode == NULL) {
494 tftp_log(LOG_ERR,
495 "Bad option - Unknown transfer mode (%s)", *mode);
496 send_error(peer, EBADOP);
497 exit(1);
498 }
499 tftp_log(LOG_INFO, "Mode: '%s'", *mode);
500
501 return (cp + 1);
502 }
503
504 /*
505 * WRQ - receive a file from the client
506 */
507 void
tftp_wrq(int peer,char * recvbuffer,ssize_t size)508 tftp_wrq(int peer, char *recvbuffer, ssize_t size)
509 {
510 char *cp;
511 int has_options = 0, ecode;
512 char *filename, *mode;
513 char fnbuf[PATH_MAX];
514
515 cp = parse_header(peer, recvbuffer, size, &filename, &mode);
516 size -= (cp - recvbuffer) + 1;
517
518 strcpy(fnbuf, filename);
519 reduce_path(fnbuf);
520 filename = fnbuf;
521
522 if (size > 0) {
523 if (options_rfc_enabled)
524 has_options = !parse_options(peer, cp, size);
525 else
526 tftp_log(LOG_INFO, "Options found but not enabled");
527 }
528
529 ecode = validate_access(peer, &filename, WRQ);
530 if (ecode == 0) {
531 if (has_options)
532 send_oack(peer);
533 else
534 send_ack(peer, 0);
535 }
536 if (logging) {
537 tftp_log(LOG_INFO, "%s: write request for %s: %s", peername,
538 filename, errtomsg(ecode));
539 }
540
541 tftp_recvfile(peer, mode);
542 exit(0);
543 }
544
545 /*
546 * RRQ - send a file to the client
547 */
548 void
tftp_rrq(int peer,char * recvbuffer,ssize_t size)549 tftp_rrq(int peer, char *recvbuffer, ssize_t size)
550 {
551 char *cp;
552 int has_options = 0, ecode;
553 char *filename, *mode;
554 char fnbuf[PATH_MAX];
555
556 cp = parse_header(peer, recvbuffer, size, &filename, &mode);
557 size -= (cp - recvbuffer) + 1;
558
559 strcpy(fnbuf, filename);
560 reduce_path(fnbuf);
561 filename = fnbuf;
562
563 if (size > 0) {
564 if (options_rfc_enabled)
565 has_options = !parse_options(peer, cp, size);
566 else
567 tftp_log(LOG_INFO, "Options found but not enabled");
568 }
569
570 ecode = validate_access(peer, &filename, RRQ);
571 if (ecode == 0) {
572 if (has_options) {
573 int n;
574 char lrecvbuffer[MAXPKTSIZE];
575 struct tftphdr *rp = (struct tftphdr *)lrecvbuffer;
576
577 send_oack(peer);
578 n = receive_packet(peer, lrecvbuffer, MAXPKTSIZE,
579 NULL, timeoutpacket);
580 if (n < 0) {
581 if (debug&DEBUG_SIMPLE)
582 tftp_log(LOG_DEBUG, "Aborting: %s",
583 rp_strerror(n));
584 return;
585 }
586 if (rp->th_opcode != ACK) {
587 if (debug&DEBUG_SIMPLE)
588 tftp_log(LOG_DEBUG,
589 "Expected ACK, got %s on OACK",
590 packettype(rp->th_opcode));
591 return;
592 }
593 }
594 }
595
596 if (logging)
597 tftp_log(LOG_INFO, "%s: read request for %s: %s", peername,
598 filename, errtomsg(ecode));
599
600 if (ecode) {
601 /*
602 * Avoid storms of naks to a RRQ broadcast for a relative
603 * bootfile pathname from a diskless Sun.
604 */
605 if (suppress_naks && *filename != '/' && ecode == ENOTFOUND)
606 exit(0);
607 send_error(peer, ecode);
608 exit(1);
609 }
610 tftp_xmitfile(peer, mode);
611 }
612
613 /*
614 * Find the next value for YYYYMMDD.nn when the file to be written should
615 * be unique. Due to the limitations of nn, we will fail if nn reaches 100.
616 * Besides, that is four updates per hour on a file, which is kind of
617 * execessive anyway.
618 */
619 static int
find_next_name(char * filename,int * fd)620 find_next_name(char *filename, int *fd)
621 {
622 int i;
623 time_t tval;
624 size_t len;
625 struct tm lt;
626 char yyyymmdd[MAXPATHLEN];
627 char newname[MAXPATHLEN];
628
629 /* Create the YYYYMMDD part of the filename */
630 time(&tval);
631 lt = *localtime(&tval);
632 len = strftime(yyyymmdd, sizeof(yyyymmdd), newfile_format, <);
633 if (len == 0) {
634 syslog(LOG_WARNING,
635 "Filename suffix too long (%d characters maximum)",
636 MAXPATHLEN);
637 return (EACCESS);
638 }
639
640 /* Make sure the new filename is not too long */
641 if (strlen(filename) > MAXPATHLEN - len - 5) {
642 syslog(LOG_WARNING,
643 "Filename too long (%zd characters, %zd maximum)",
644 strlen(filename), MAXPATHLEN - len - 5);
645 return (EACCESS);
646 }
647
648 /* Find the first file which doesn't exist */
649 for (i = 0; i < 100; i++) {
650 sprintf(newname, "%s.%s.%02d", filename, yyyymmdd, i);
651 *fd = open(newname,
652 O_WRONLY | O_CREAT | O_EXCL,
653 S_IRUSR | S_IWUSR | S_IRGRP |
654 S_IWGRP | S_IROTH | S_IWOTH);
655 if (*fd > 0)
656 return 0;
657 }
658
659 return (EEXIST);
660 }
661
662 /*
663 * Validate file access. Since we
664 * have no uid or gid, for now require
665 * file to exist and be publicly
666 * readable/writable.
667 * If we were invoked with arguments
668 * from inetd then the file must also be
669 * in one of the given directory prefixes.
670 * Note also, full path name must be
671 * given as we have no login directory.
672 */
673 int
validate_access(int peer,char ** filep,int mode)674 validate_access(int peer, char **filep, int mode)
675 {
676 struct stat stbuf;
677 int fd;
678 int error;
679 struct dirlist *dirp;
680 static char pathname[MAXPATHLEN];
681 char *filename = *filep;
682
683 /*
684 * Prevent tricksters from getting around the directory restrictions
685 */
686 if (strstr(filename, "/../"))
687 return (EACCESS);
688
689 if (*filename == '/') {
690 /*
691 * Allow the request if it's in one of the approved locations.
692 * Special case: check the null prefix ("/") by looking
693 * for length = 1 and relying on the arg. processing that
694 * it's a /.
695 */
696 for (dirp = dirs; dirp->name != NULL; dirp++) {
697 if (dirp->len == 1 ||
698 (!strncmp(filename, dirp->name, dirp->len) &&
699 filename[dirp->len] == '/'))
700 break;
701 }
702 /* If directory list is empty, allow access to any file */
703 if (dirp->name == NULL && dirp != dirs)
704 return (EACCESS);
705 if (stat(filename, &stbuf) < 0)
706 return (errno == ENOENT ? ENOTFOUND : EACCESS);
707 if ((stbuf.st_mode & S_IFMT) != S_IFREG)
708 return (ENOTFOUND);
709 if (mode == RRQ) {
710 if ((stbuf.st_mode & S_IROTH) == 0)
711 return (EACCESS);
712 } else {
713 if ((stbuf.st_mode & S_IWOTH) == 0)
714 return (EACCESS);
715 }
716 } else {
717 int err;
718
719 /*
720 * Relative file name: search the approved locations for it.
721 * Don't allow write requests that avoid directory
722 * restrictions.
723 */
724
725 if (!strncmp(filename, "../", 3))
726 return (EACCESS);
727
728 /*
729 * If the file exists in one of the directories and isn't
730 * readable, continue looking. However, change the error code
731 * to give an indication that the file exists.
732 */
733 err = ENOTFOUND;
734 for (dirp = dirs; dirp->name != NULL; dirp++) {
735 snprintf(pathname, sizeof(pathname), "%s/%s",
736 dirp->name, filename);
737 if (stat(pathname, &stbuf) == 0 &&
738 (stbuf.st_mode & S_IFMT) == S_IFREG) {
739 if ((stbuf.st_mode & S_IROTH) != 0) {
740 break;
741 }
742 err = EACCESS;
743 }
744 }
745 if (dirp->name != NULL)
746 *filep = filename = pathname;
747 else if (mode == RRQ)
748 return (err);
749 }
750
751 /*
752 * This option is handled here because it (might) require(s) the
753 * size of the file.
754 */
755 option_tsize(peer, NULL, mode, &stbuf);
756
757 if (mode == RRQ)
758 fd = open(filename, O_RDONLY);
759 else {
760 if (create_new) {
761 if (increase_name) {
762 error = find_next_name(filename, &fd);
763 if (error > 0)
764 return (error + 100);
765 } else
766 fd = open(filename,
767 O_WRONLY | O_TRUNC | O_CREAT,
768 S_IRUSR | S_IWUSR | S_IRGRP |
769 S_IWGRP | S_IROTH | S_IWOTH );
770 } else
771 fd = open(filename, O_WRONLY | O_TRUNC);
772 }
773 if (fd < 0)
774 return (errno + 100);
775 file = fdopen(fd, (mode == RRQ)? "r":"w");
776 if (file == NULL) {
777 close(fd);
778 return (errno + 100);
779 }
780 return (0);
781 }
782
783 static void
tftp_xmitfile(int peer,const char * mode)784 tftp_xmitfile(int peer, const char *mode)
785 {
786 uint16_t block;
787 time_t now;
788 struct tftp_stats ts;
789
790 now = time(NULL);
791 if (debug&DEBUG_SIMPLE)
792 tftp_log(LOG_DEBUG, "Transmitting file");
793
794 read_init(0, file, mode);
795 block = 1;
796 tftp_send(peer, &block, &ts);
797 read_close();
798 if (debug&DEBUG_SIMPLE)
799 tftp_log(LOG_INFO, "Sent %jd bytes in %jd seconds",
800 (intmax_t)ts.amount, (intmax_t)time(NULL) - now);
801 }
802
803 static void
tftp_recvfile(int peer,const char * mode)804 tftp_recvfile(int peer, const char *mode)
805 {
806 uint16_t block;
807 struct timeval now1, now2;
808 struct tftp_stats ts;
809
810 gettimeofday(&now1, NULL);
811 if (debug&DEBUG_SIMPLE)
812 tftp_log(LOG_DEBUG, "Receiving file");
813
814 write_init(0, file, mode);
815
816 block = 0;
817 tftp_receive(peer, &block, &ts, NULL, 0);
818
819 write_close();
820 gettimeofday(&now2, NULL);
821
822 if (debug&DEBUG_SIMPLE) {
823 double f;
824 if (now1.tv_usec > now2.tv_usec) {
825 now2.tv_usec += 1000000;
826 now2.tv_sec--;
827 }
828
829 f = now2.tv_sec - now1.tv_sec +
830 (now2.tv_usec - now1.tv_usec) / 100000.0;
831 tftp_log(LOG_INFO,
832 "Download of %jd bytes in %d blocks completed after %0.1f seconds\n",
833 (intmax_t)ts.amount, block, f);
834 }
835
836 return;
837 }
838